Simultaneous analysis of the elastic scattering and breakup channel for the reactionLi11+Pb208at energies near the Coulomb barrier

Abstract

We present a detailed analysis of the elastic scattering and breakup channel for the reaction of 11 Li on 208 Pb at incident laboratory energies of 24.3 and 29.8 MeV, measured at the radioactive ion beam facility of TRIUMF, in Vancouver, Canada. A large yield of 9 Li fragments was detected by four charged particle telescopes in a wide angular range. The experimental angular and energy distributions of these 9 Li fragments have been compared to coupled-reaction-channel and continuum-discretized coupled-channel calculations. The large production of 9 Li fragments at small angles can be explained by considering a direct breakup mechanism, while at medium-large angles a competition between direct breakup and neutron transfer to the continuum of the 208 Pb target was observed.

Scattering of the Halo Nucleus Be11 on Au197Pesudo1, Borge2, Moro3 et al. 2017Phys. Rev. Lett.Self Cite561470View full textAdd to dashboardCite

“…Their structure is induced by the presence of very weakly bound protons or neutrons in low l orbits, giving rise to a diffuse matter distribution. Reactions of halo nuclei at energies around the Coulomb barrier [1][2][3][4][5][6][7][8][9] unveil the importance of the structure of halo nuclei in the dynamics of the reaction process. Their weakly bound nucleons provide insight into degrees of freedom connected to slow processes.…”

Elastic scattering, inelastic excitation, and neutron transfer for Li7+Sn120 at energies around the Coulomb barrier

“…Understanding the structure and reaction mechanisms involving weakly bound nuclei is a first step to understand the exotic nuclei [9,10]. The beam intensities for stable nuclei are higher than those for the exotic ones.…”

Recent Developments for the Calculation of Elastic and Non-elastic Breakup of Weakly-bound Nuclei

“…It is worth noting, nevertheless, that the relative importance of EBU and NEB may largely depend on the system and on the energy. For example, in reactions induced by halo nuclei on heavy targets at near-barrier energies the inclusive breakup cross section is, in general, dominated by the EBU mechanism [41,42]. This is a consequence of the long-range Coulomb couplings arising from the strong polarizability of the projectile, which favor distant breakup and suppress the absorption of the unobserved particle (the halo neutron(s) in this case).…”

“…For example, the dashed line is the two-neutron transfer contribution, which is found to contribute only at the largest angles (adapted from Ref. [42]).…”